Grinding-mill.



T. L. & T. J. STURTEVANT.

GRINDING MILL.

APPLICATION FILED OUT. 5, 1905.

Patented June 8, 1909.

wzmaaea/ 'UNKTTED a Y I in mine i GRINDXNG-IEILL.

No., 924,01e.

at Quincy and Wellesley, in the county of Norfolk and State ofMassachusetts, have invented or discovered certain new and usefulImprovements in Grindingdliills, of which the following is aspecification, reference be ing had therein to the accompanying drawmgs.r I

This invention relates to that class of grinders or grinding mills inwhich a rotating disk or late cooperates with. a stationary disk or pate, the material to be ground being fed to the central portions of saiddisks or plates so that as it is reduced it works out-- ward therefromvIn this class of grinders, and particularly where metallic grindingdisks or plates are employed, the said disks or plates, when in use,become out or scored in circles orjrin s which wear dee er and deeper,so that iine grinding soon iiecomes impossible, and the grinding disksor plates have to be discarded although not nearly worn out.

This invention has for its object to remedy the difhculty referred to byso mounting one of the grinding disks or plates that it may be adjustedin a plane which is transverse to the axis of the rotating disk orplate, or to the axis of the shaft by which said rotating disk or plateis carried. In effecting such transverse adjustment of one of thegrinding disks or lates the stationary disk or plate is referab ymounted for such adjustment. .n the preferred form of our invention,however, the stationary disk or late mounted on a pivoted or swinging voer-like part hinged toe vertical pin or bolt, and means are rovided forraising or lowering the said doorike part to adjust the said stationarydisk or plate carried thereby in a, plane transverse to the axis of therotating 7 late, and thereby change the center of one p ate relative tothe other, so that the tendency of the plates to wear in groovingcircles may be avoided. Of course the adjustable plate ma be so mountedas to be moved horizontal y, instead of verti cally, in this adjustment,if desired. The door-like part on which the adjustable plate ismounted-can be swung aside when access to the interior portion of themill or the grinding chamber 'is desired.

Specification 03? Letters Eatent.

Application filed october 6, race. No. $181,404.

Patented June 8, 3.909.

in the accompanying drawings, Figure 1 is a longitudinal section of agrinder, embodying the presentinvention, and Fig. 2 is an end viewthereoi looking from the right of Fig.

Referring to the drawings, 12 denotes the frame of the machine on whichis mounted the 'iorizontal driving shaft 13 to which is d the wheel ordisk 14. carrying the rog grinding 15 rotating in a vertical plane andattached to said Wheel or disk in any suitable manner, as by means ofbolts 16. The shaft 13 is adjustable longitudinally to secure thedesired fineness of the output of the mill, ins welhknown manner, bymeans of a screw 17 provided with a hand Wheel 18 and the said shaft isalso furnished with the usual fast and loose pulleys 19 and 20.

The frame 12 is provided with cars 21 to which attached spin or bolt 22serving as a pivot or hinge for the door-like part 23 having earsthrough which the said pin or bolt passes. liiounted on the hinged ordoorlike part 23 the vertically disposed and normally stationarygrinding disk or plate 25, and the said hinged door-like part 23 isprovided with a feed opening or hopper 26 opening downward into the "eyeof the mill, or the central iortions of the grinding disks or plates. 'ie door-like part 23 is provided at its top with an arm 27 furnished withan adjusting screw 28 abutting against the top of the mill casing 29,said screw being preferably provided with a hand wheel 30, and with aset nut 31. The hinged or doorlike part 23 is pretoralidy provided witha suitable catch or latch 32 engaging portion of the stationary frameand serving to hold the said hinged part closed.

From the foregoing it will be obvious that an adjustment of thestationary disk or plate 25, transverse to the center of the drivingshaft 13, or transverse to the axis of the ro tating disk or plate, maybe, ellccted by means of the screw 28 serving to raise or lower'thchinged door-like part 23, on which the said stationary or non-rotatingdisk or plate is mountcd,so as to change the center of one of thegrinding disks or plates relative to the other, for the purpose ol'bringing dil iercnl portions ol said plates opposite each other andthereby evenly distriliuiting the wear and preventing the adjacent facesof the said disks or plates from becoming scored or grooved in circles.By thus adjusting one of the said grinding lates or disks relative tothe other their Wor ing lives will be very considerably extended and theex ense of frequent renewals of these plates wi 1 therefore be avoided.

Having thus described our invention we claim and desire to secure byLetters Patent:

ing a section adjustab 1. In a grinding machine, the combination with arotating disk or late, of a casing havi; transversely to the axis ofrotation of said rotating disk or plate, a stationary disk carried bysaid adjustable section, and an adjusting screw for moving saidadjustable section transversely to the said axis of rotation of saidrotating disk or ate. p 2. In a grinding machine, the combination with arotating disk or late, of a casing having a section adjustablbtransversely to the axis of rotation of said rotating disk or plate, astationary disk carried by said adjustable section, and means foradjusting said adjustable section.

3. In a grinding machine, the combination with'a rotating disk or plate,of a stationary disk or plate, a casing having a hinged or pivoted parton which said stationary disk or plate is mounted, and means foradjusting the said hinged or pivoted part transversely to the axis ofthe said rotatmg disk or plate.

5. In'a grinding mill, the combinatioiT with a rotating grinding disk orplate and a casing within which the same is mounted, of a door-like artclosing the end of the chamber formed y the said casing and mounted on avertical hinge or art so as to swing horizontally, said doorike parthaving a horizontally extending arm overla ping said casing, astationary grinding dis or platemounted on said door-like part, and ascrew tapped in said arm and abutting against said casing for adjustingthe said door-like part vertically ofii'ts hinge or pivot for thepurpose of varying, the eccentricity of the said stationary disk orplate relative to" the said rotating disk or plate.

In testimony whereof we afiix our signatures, in presence of twowitnesses.

THOMAS LEGGETT STURTEVANT. THOMAS JOSEPH STUR'lEVANT. Witnesses:

L. H. STURTEVANT, E. M. HILTON.

